PDA

View Full Version : Problem with this code and mingw32



Rulz
03-02-2002, 12:03 PM
hehe, hope i can post code

/*removed code, look at bottom*/

What is strane is that it will not draw the triangle, and only displays a black screen, why?

thanks

[This message has been edited by Rulz (edited 03-08-2002).]

03-02-2002, 11:35 PM
You are using PFD_DOUBLEBUFFER so you need to swap buffers in your draw function.

Rulz
03-07-2002, 06:45 AM
strange, still doesn't work:

} else {

DrawGLScene();
SwapBuffers(hDC); //new

}

just a black screen

sherlock
03-07-2002, 02:49 PM
Instead of putting SwapBuffers(); after DrawGLScene(); try putting it in place of glFlush();.

Also try it without the glTranslatef(0.0f, 0.0f, -6.0f);.

Rulz
03-08-2002, 07:15 AM
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>

#define myClearScreen glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
#define mySwap SwapBuffers(hDC);
#define myReset glLoadIdentity();

// Function Declarations
LRESULT CALLBACK
WndProc( HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam );
VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC );
VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC );

GLfloat rtri;

int resulutionx=800;
int resulutiony=600;

//Extra Functions (to tiden up the code)
int InitGL(GLvoid) //Init code in here
{
glShadeModel(GL_SMOOTH); //Smooth Shading
glClearColor(0.7f,0.5f,0.5f,1.0f);
glClearDepth(1.0f); //Depth of clearing
glEnable(GL_DEPTH_TEST); //Enable depth test
glDepthFunc(GL_LEQUAL); //type of testing
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); //nicest perspective correction
glMatrixMode(GL_PROJECTION); //projection matrix
return 1;
}

int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing
{
myClearScreen;
glColor3f(1.0, 0.3, 0.0);
myReset;
glRotatef(rtri,0.0f,1.0f,0.0f);
glBegin(GL_TRIANGLES); // Start Drawing A Triangle
glColor3f(1.0f,0.0f,0.0f); // Set Top Point Of Triangle To Red
glVertex3f( 0.0f, 1.0f, 0.0f); // First Point Of The Triangle
glColor3f(0.0f,1.0f,0.0f); // Set Left Point Of Triangle To Green
glVertex3f(-1.0f,-1.0f, 0.0f); // Second Point Of The Triangle
glColor3f(0.0f,0.0f,1.0f); // Set Right Point Of Triangle To Blue
glVertex3f( 1.0f,-1.0f, 0.0f); // Third Point Of The Triangle
glEnd();
rtri+=0.2f;
return 1;
}

int WINAPI
WinMain( HINSTANCE hInstance , HINSTANCE hPrevInstance , LPSTR lpCmdLine , int iCmdShow )
{
WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL bQuit = FALSE;
float theta = 0.0f;

wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = "GLSample";
RegisterClass( &wc );

if (MessageBox(NULL,"Do ya want hi-res?", "Hi-res?",MB_YESNO|MB_ICONQUESTION)==IDYES)
{
resulutionx=1024;
resulutiony=768; // Windowed Mode
}

hWnd = CreateWindow( "GLSample", "OpenGL Sample", WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE, 0, 0, resulutionx , resulutiony , NULL, NULL, hInstance, NULL );
EnableOpenGL( hWnd, &hDC, &hRC );
InitGL();

while ( !bQuit ) {

// check for messages
if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) ) {

// handle or dispatch messages
if ( msg.message == WM_QUIT ) {
bQuit = TRUE;
} else {
TranslateMessage( &msg );
DispatchMessage( &msg );
}

} else {

DrawGLScene();
mySwap;

}

}

// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );

// destroy the window explicitly
DestroyWindow( hWnd );

return msg.wParam;

}

// Window Procedure

LRESULT CALLBACK
WndProc( HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam )
{

switch ( message ) {

case WM_CREATE:
return 0;

case WM_CLOSE:
PostQuitMessage( 0 );
return 0;

case WM_DESTROY:
return 0;

case WM_KEYDOWN:
switch ( wParam ) {

case VK_ESCAPE:
PostQuitMessage( 0 );
return 0;

}
return 0;

default:
return DefWindowProc( hWnd,
message, wParam, lParam );

}

}

// Enable OpenGL

VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC )
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;

// get the device context (DC)
*hDC = GetDC( hWnd );

// set the pixel format for the DC
ZeroMemory( &pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat( *hDC, &pfd );
SetPixelFormat( *hDC, iFormat, &pfd );

// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );

}

// Disable OpenGL

VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC )
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}

strange, now animation won't work (I can display and create things)it almost seems like it is stuck at frame one, i will do some more testing to narrow the problem down if i can

[This message has been edited by Rulz (edited 03-08-2002).]